<script>
function dateD(time){
    var d_minutes,d_hours,d_days,d;
    var nowTime=parseInt(new Date().getTime()/1000);
    newTime=new Date(time).getTime()/1000;
    d=newTime-nowTime;
    d_days = parseInt(d/86400);       
    d_hours = parseInt(d/3600);       
    d_minutes = parseInt(d/60); 
    if(d_days>0){
        return d_days+'天前'
    }else if(d_days<=0&&d_hours>0){
        return d_hours+'小时前';
    }else if(d_hours<=0 && d_minutes>0){       
        return d_minutes+"分钟前";
    }else{
        return '刚刚'
    }
}
alert(dateD('2021-11-26 11:21:02'));



</script>